<template>

<el-container class="home-container">
    <!-- 头部区域 -->
  <el-header>
      <div>
          <img src="../assets/logo.jpg" alt="" style="width:60px; height:60px" >
          <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
  </el-header>
    <!-- 页面主体区域 -->
  <el-container>
      <!-- 侧边栏 -->
    <el-aside width="isCollapse ? '24px' : '200px'"> 
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
    <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409eff" :unique-opened="true" 
      :collapse="isCollapse" :collapse-transition="false" 
      router>
      <!-- 导航-->
      <!-- 一级导航 -->
       <el-submenu v-for="(item ,index,key) in $router.options.routes" v-if="index>2"  :index="index+''"  :key="key">
        <template slot="title">
          <i class='iconfont' :class="item.icon"></i>
          <span>{{item.name}}</span>
        </template>
        <!-- 二级导航 -->
        <el-menu-item v-for="(item1,key) in item.children" :index="item1.path" :key="key"
          :class="$route.path==item1.path ? 'is-active':''">
            <template slot="title">
                <i class="el-icon-message"></i>
                <span>{{item1.name}}</span>
            </template>
        </el-menu-item>
       </el-submenu>
    </el-menu>
    </el-aside>
      <!-- 右侧内容布局 -->
    <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
    data () {
        return {
            // 是否折叠
             isCollapse: false,
        }
       
    },
//部件
 components: {
 },
//静态
 props: {
 },
//对象内部的属性监听，也叫深度监听
 watch: {
 },
//属性的结果会被缓存，除非依赖的响应式属性变化才会重新计算。主要当作属性来使用；
 computed: { 
    routes: function(){
        return this.routes.filter(function (routes) {
          return this.routes.index>2;
})
    }
 },
//方法表示一个具体的操作，主要书写业务逻辑；
 methods: { 
     logout(){
         window.sessionStorage.clear();
         this.$router.push('/login');
     },
    //  点击按钮， 切换菜单的折叠与展开
     toggleCollapse() {
            this.isCollapse = !this.isCollapse;
     }
 },
//请求数据
 created() {
     
},
 mounted() {
}
}
</script>

<style lang="less" scoped>
.home-container{
    height: 100%;
}
.el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0%;
    align-items: center;
    color: #ffffff;
    font-size: 20px;
    > div{
        display: flex;
        align-items: center;
        span{
            margin-left: 15px;
        }
    }
}
.el-aside{
    background-color: #333744;
    .el-menu {
        border-right: none;
    }
}
.el-main{
    background-color: #eaedf1;
}
.toggle-button {
    background-color: #4a5064;
    font-size: 13px;
    line-height: 24px;
    color:#fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>
